Seasonal Decomposition Question

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Seasonal Decomposition Question

E. Bernardo-2
Dear Members,

Sorry, the question is about seasonal decomposition, rather than SPSS.  
One method of seasonal decomposition is Additive Method.  Additive method is used if the seasonal fluctuation does not vary with the level of the series. Can you suggest a statistical method that can be used to test if the seasonal fluctuation does not vary with the level of the series. 

Thank you.
E.
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